File extension 7zip

Name: Archive Files

Popularity: 1

Open With: 7-zip

What is this 7zip file?

7z is the new backup, archive - compressed file format, providing high compression ratio. The main features of 7z format: - Open architecture - High compression ratio - Strong AES-256 encryption - Ability of using any compression, conversion or encryption method - Support for very large files with sizes up to 16000000000 GB - Unicode file name support - Solid compression ratio - Archive headers compression 7z has an open architecture, so it can support any new compression method, too. The following methods currently are integrated into 7z: LZMA Improved and optimized version of LZ77 algorithm PPMD Dmitry Shkarin's PPMdH with small changes BCJ Converter for 32-bit x86 executables BCJ2 Converter for 32-bit x86 executables BZip2 Standard BWT algorithm Deflate Standard LZ77-based algorithm LZMA is the default and general compression method of 7z format. The main features of LZMA are: ?High compression ratio ?Variable dictionary size (up to 4 GB) ?Compression speed: about 1 MB/s on 2 GHz CPU ?Decompression speed: about 10-20 MB/s on 2 GHz CPU ?Small memory requirement for decompression (depend from dictionary size) ?Small code size for decompression: about 5 KB ?Supports multi-threading and P4's hyper-threading The LZMA compression algorithm is very suitable for embedded applications. LZMA is released under the terms of the GNU LGPL. 7-Zip supports encryption with the AES-256 algorithm. This algorithm uses a cipher key with a length of 256 bits. To create that key, 7-Zip runs a derivation function based on a SHA-256 hash algorithm. A key derivation function produces a derived key from the text password entered by the user. To increase the cost of an exhaustive search to crack a password, 7-Zip uses a large number of iterations when it produces a cipher key from a password. 7z is part of the 7-Zip program distributed under the GNU LGPL